Abstract: In an exemplary embodiment, there is an auxiliary antenna device for a handheld radio communication device including ground plane means extending in a main direction and a main antenna device having an antenna element operatively coupled to the ground plane means and configured for reception of signals at a selected frequency and polarized essentially in the main direction. The auxiliary antenna device includes a balanced or self-balanced antenna element arrangement, an amplifier, and an output port. The balanced or self-balanced antenna element arrangement is configured for reception of signals at the selected frequency and polarized in a direction essentially orthogonal to the main direction. The amplifier is operatively connected to the balanced or self-balanced antenna element arrangement and configured for amplification of signals received by the balanced or self-balanced antenna element arrangement.

Abstract: Exemplary embodiments are disclosed of switching arrangements for antenna devices. Exemplary embodiments are also disclosed of antenna arrangements and portable radio communication devices including such switching arrangements. An exemplary embodiment includes a switching arrangement for an antenna device operational in at least two frequency bands. In this example, the switching arrangement generally includes a switching device that is switchable into at least a first state and a second state. The switching device includes at least a first port, a second port, and a third port. The first port is connectable to an antenna device. The second port is connected to the first port in the first state. The third port is connected to the first port in the second state. The switching arrangement includes an inductor connected between the first port and ground.

Abstract: An exemplary embodiment of an antenna device for operation in at least two operational frequency bands generally includes a loop element having a feeding end for connection to radio communication circuitry and a grounding end for connection to ground. The antenna device also includes first filtering means connecting the grounding end to ground, and switching means parallel with the first filtering means. The switching means is configured to connect the grounding end to ground parallel with the first filtering means in a first state, to match the loop element to a first operational frequency band of the at least two operational frequency bands. The switching means is configured to connect the grounding end to an open end parallel with the first filtering means in a second state, to match the loop element to a second operational frequency band of the at least two operational frequency bands.

Abstract: An exemplary embodiment of an antenna device generally includes a radiator structure with at least one first radiator element. The antenna device also includes a first feeding connection coupling the radiator structure to a first radio circuit for operation in a first frequency band. The antenna device further includes a second feeding connection coupling the radiator structure to a second radio circuit for operation in a second frequency band. A set of capacitors is connected to the radiator structure. This set includes at least one capacitor where a first end of each capacitor in the set is connected to the radiator structure and a second end is provided at ground potential, at least for the first frequency band. The sum of the values of the capacitors in the set is below 15 picofarads.

Abstract: An exemplary embodiment of an antenna device generally includes a loop element having a length providing loop resonance at a first wavelength, where a resonance frequency of this wavelength is used in a desired frequency band. A capacitance is provided between a first position on the element and ground, thereby dividing the element into a first and a second section. The second section has an inductance that depends on the length and forms a resonance circuit with the capacitance which causes the element to function as a monopole element at the resonance frequency of the resonance circuit. The first position and capacitance are configured for the resonance circuit resonance frequency to lie in the desired frequency band. The first position is configured such that the length of the first section provides a monopole resonance at a second wavelength having one resonance frequency at the resonance circuit resonance frequency.

Abstract: An exemplary embodiment includes an antenna arrangement for a portable radio communication device comprising an NFC (near field communication) antenna, a BT (Bluetooth) antenna and an FM (frequency modulation) antenna. The NFC antenna, BT antenna and FM antenna are positioned in close proximity to each other and are operable simultaneously. The NFC antenna is fed through a first decoupling filter and is grounded through a second decoupling filter.

Abstract: An exemplary embodiment includes an antenna arrangement for a portable radio communication device comprising at least a first radiating element and a ground plane means. The antenna arrangement comprises a first conductor, which first conductor in a first point is electrically connected to the ground plane means through a high pass filter means and in a first end is open ended. A second end of the first conductor is connected to a FM receiver, FM transmitter, or FM transceiver.

Abstract: An antenna device for a portable radio communication device comprises a first electrically conductive radiating element including a basic resonance defining section having a first end, a length varying section connected between a feed point of the radiating element and the first end of the basic resonance defining section. The length varying section includes a set of parallel conductive paths and a first switching element selectively supplying radio signals between the feed point and the basic resonance defining section via one of the paths in the set. Each path influences the resonance of the radiating element in a separate way and at least one path includes a reactive element for adjusting the resonance of the first radiating element.

Abstract: A semiconductor device is disclosed. In one embodiment, the semiconductor device includes a first resistor, a second resistor, and a transistor. The second resistor is configured to receive a current via the first resistor. The transistor is configured to be driven via the first resistor and the second resistor and provide a compensation current. The current includes the compensation current and a reference current and changes in the current are compensated for via the compensation current which limits changes in the reference current.

Abstract: A semiconductor device is disclosed. In one embodiment, the semiconductor device includes a first resistor, a second resistor, and a transistor. The second resistor is configured to receive a current via the first resistor. The transistor is configured to be driven via the first resistor and the second resistor and provide a compensation current. The current includes the compensation current and a reference current and changes in the current are compensated for via the compensation current which limits changes in the reference current.

Abstract: Vibration damper, in particular for motor vehicles, including a work cylinder, a work piston fastened to a piston rod and dividing the work cylinder into two work chambers, possibly an equalization chamber and a piston rod guide which seals the piston rod against the atmosphere, whereby the work chambers are filled with a magnetorheological fluid to which an electric coil can be applied. In the event of a failure or malfunction of the electric coil, it must be possible to achieve a safe damping force, by having at least one permanent magnetic field which acts on the magnetorheological fluid.